/*
 * SPDX-License-Identifier: BSD-3-Clause
 */

/*
 * This is a sample demonstration application that showcases usage of rpmsg
 * This application is meant to run on the remote CPU running baremetal code.
 * This application echoes back data that was sent to it by the host core.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <openamp/open_amp.h>
#include <metal/alloc.h>
#include "platform_info.h"
#include "rpmsg-echo.h"

#define LPRINTF(format, ...) printf(format, ##__VA_ARGS__)
#define LPERROR(format, ...) LPRINTF("ERROR: " format, ##__VA_ARGS__)

struct _payload {
	unsigned long num;
	unsigned long size;
	unsigned char data[];
};

static int err_cnt;

#define PAYLOAD_MIN_SIZE	1

/* Globals */
static struct rpmsg_endpoint lept;
static struct _payload *i_payload;
static int rnum = 0;
static int err_cnt = 0;
static int ept_deleted = 0;

/*-----------------------------------------------------------------------------*
 *  RPMSG endpoint callbacks
 *-----------------------------------------------------------------------------*/
static int rpmsg_endpoint_cb(struct rpmsg_endpoint *ept, void *data, size_t len,
			     uint32_t src, void *priv)
{
	int i;
	struct _payload *r_payload = (struct _payload *)data;

	(void)ept;
	(void)src;
	(void)priv;
	LPRINTF(" received payload number %lu of size %lu \r\n",
		r_payload->num, (unsigned long)len);

	if (r_payload->size == 0) {
		LPERROR(" Invalid size of package is received.\r\n");
		err_cnt++;
		return RPMSG_SUCCESS;
	}
	/* Validate data buffer integrity. */
	for (i = 0; i < (int)r_payload->size; i++) {
		if (r_payload->data[i] != 0xA5) {
			LPRINTF("Data corruption at index %d\r\n", i);
			err_cnt++;
			break;
		}
	}
	rnum = r_payload->num + 1;
	return RPMSG_SUCCESS;
}

static void rpmsg_service_unbind(struct rpmsg_endpoint *ept)
{
	(void)ept;
	rpmsg_destroy_ept(&lept);
	LPRINTF("echo test: service is destroyed\r\n");
	ept_deleted = 1;
}

static void rpmsg_name_service_bind_cb(struct rpmsg_device *rdev,
				       const char *name, uint32_t dest)
{
	LPRINTF("new endpoint notification is received.\r\n");
	if (strcmp(name, RPMSG_SERVICE_NAME))
		LPERROR("Unexpected name service %s.\r\n", name);
	else
		(void)rpmsg_create_ept(&lept, rdev, RPMSG_SERVICE_NAME,
				       RPMSG_ADDR_ANY, dest,
				       rpmsg_endpoint_cb,
				       rpmsg_service_unbind);
}

/*-----------------------------------------------------------------------------*
 *  Application
 *-----------------------------------------------------------------------------*/
int app (struct rpmsg_device *rdev, void *priv)
{
	int ret;
	int i;
	int size, max_size, num_payloads;
	int expect_rnum = 0;

	LPRINTF(" 1 - Send data to remote core, retrieve the echo");
	LPRINTF(" and validate its integrity ..\r\n");

	/* Create RPMsg endpoint */
	ret = rpmsg_create_ept(&lept, rdev, RPMSG_SERVICE_NAME,
			       RPMSG_ADDR_ANY, RPMSG_ADDR_ANY,
			       rpmsg_endpoint_cb, rpmsg_service_unbind);

	if (ret) {
		LPERROR("Failed to create RPMsg endpoint.\r\n");
		return ret;
	}

	max_size = rpmsg_get_tx_buffer_size(&lept);
	if (max_size <= 0) {
		LPERROR("No available buffer size.\r\n");
		rpmsg_destroy_ept(&lept);
		return -1;
	}
	max_size -= sizeof(struct _payload);
	num_payloads = max_size - PAYLOAD_MIN_SIZE + 1;
	i_payload =
	    (struct _payload *)metal_allocate_memory(2 * sizeof(unsigned long) +
				      max_size);

	if (!i_payload) {
		LPERROR("memory allocation failed.\r\n");
		rpmsg_destroy_ept(&lept);
		return -1;
	}

	LPRINTF("RPMsg device TX buffer size: %#x\r\n", rpmsg_get_tx_buffer_size(&lept));
	LPRINTF("RPMsg device RX buffer size: %#x\r\n", rpmsg_get_rx_buffer_size(&lept));

	while (!is_rpmsg_ept_ready(&lept))
		platform_poll(priv);

	LPRINTF("RPMSG endpoint is binded with remote.\r\n");
	for (i = 0, size = PAYLOAD_MIN_SIZE; i < num_payloads; i++, size++) {
		i_payload->num = i;
		i_payload->size = size;

		/* Mark the data buffer. */
		memset(&(i_payload->data[0]), 0xA5, size);

		LPRINTF("sending payload number %lu of size %lu\r\n",
			i_payload->num,
			(unsigned long)(2 * sizeof(unsigned long)) + size);

		ret = rpmsg_send(&lept, i_payload,
				 (2 * sizeof(unsigned long)) + size);

		if (ret < 0) {
			LPERROR("Failed to send data...\r\n");
			break;
		}
		LPRINTF("echo test: sent : %lu\r\n",
			(unsigned long)(2 * sizeof(unsigned long)) + size);

		expect_rnum++;
		do {
			platform_poll(priv);
		} while ((rnum < expect_rnum) && !err_cnt && !ept_deleted);

	}

	LPRINTF("**********************************\r\n");
	LPRINTF(" Test Results: Error count = %d \r\n", err_cnt);
	LPRINTF("**********************************\r\n");
	/* Destroy the RPMsg endpoint */
	rpmsg_destroy_ept(&lept);
	LPRINTF("Quitting application .. Echo test end\r\n");

	metal_free_memory(i_payload);
	return 0;
}

int main(int argc, char *argv[])
{
	void *platform;
	struct rpmsg_device *rpdev;
	int ret;

	/* Initialize platform */
	ret = platform_init(argc, argv, &platform);
	if (ret) {
		LPERROR("Failed to initialize platform.\r\n");
		ret = -1;
	} else {
		rpdev = platform_create_rpmsg_vdev(platform, 0,
						  VIRTIO_DEV_DRIVER,
						  NULL,
						  rpmsg_name_service_bind_cb);
		if (!rpdev) {
			LPERROR("Failed to create rpmsg virtio device.\r\n");
			ret = -1;
		} else {
			app(rpdev, platform);
			platform_release_rpmsg_vdev(rpdev, platform);
			ret = 0;
		}
	}

	LPRINTF("Stopping application...\r\n");
	platform_cleanup(platform);

	return ret;
}

